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Browsing Geogaceta -- Nº 20-7, (1996) by Title
Now showing items 19-38 of 69
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Edad devónica (Struniense) de las mineralizaciones de Aznalcóllar (Faja Piritica Ibérica) en base a palinología
Pereira, Z.; Sáez Ramos, Reinaldo
; Pons, J. M.; Oliveira, J. T.; Moreno Garrido, María Carmen (Sociedad Geológica de España, 1996)
Black shales associated to productive horizon In the Aznalcollar mine have provided mlospore assemblages from the Uppermost Devonian (Strunian, LN Miospore Blozone of Western Europe). StratEgraphic location of black shales ... -
El campo pegmagmático de Forcarei Norte y las míneralizaciones de fosfatos asociadas (Galicia, España)
(Sociedad Geológica de España, 1996)The aim of this paper is to present the most important mineralogical, textural and petrological characteristics of the Forcarei Norte pegmatite field. On the basis of on their internal structure, mineralogical association ... -
El campo pegmatítico de Lalín y sus mineralizaciones de Sn, Ta y Nb asociadas (Pontevedra, Galicia, España)
(Sociedad Geológica de España, 1996)The aim of this paper is to present the most important mineralogical, textural and pretrological characteristics of the Lalin pegmatite field. We can establish two different types of zoned pegmatites, with Li and without ... -
El límite Paleoceno/Eoceno en España: características y posibilidades
(Sociedad Geológica de España, 1996)The Paleocene / Eocene boundary has been studied for the last seven years by the Spanish working group of ICCP project 308. Many sections have been sampled and studied, concluding that the most suitable sections to define ... -
El magmatismo alcalino jurásico del sector SE de la Cadena Ibérica: composición y estructura
(Sociedad Geológica de España, 1996)Jurassic volcanic rocks are well exposed in the Sierra de Javalambre (Teruel)., This multiepisodic volcanism is mainly volcaniclastic , showing a large variety of fragmentation and emplacement mechanisms, and it is ... -
El metamorfismo de contacto e hidrotermalismo asociados al batolito de la Maladeta: Geoquímica isotópica de C y O en carbonates
(Sociedad Geológica de España, 1996)The isotopic composition of carbonates related to the skarn and contact metamorphic aureole of La Maladeta batholith show a broad range of variation. The whole set of obtained data can be modeled by means of an isotopic ... -
El origen de los fluidos hidrotermales en el Skarn férrico de Colmenar-Santa Bárbara (Zona de Ossa Morena)
(Sociedad Geológica de España, 1996)Oxygen and carbon isotopes o f the hydrothermal minerals in the Colmenar-Santa Bárbara skarn suggest that fluids of the main hydrothermal stage (grandite/clinopyroxene and actinolite+magnetite) are of likely magmatic origin. ... -
El Programa Internacional de Correlación Geológica (PICG): Perspectiva internacional y española
(Sociedad Geológica de España, 1996)The outcome of a lengthy process of consultations and preparatory work culminated,in 1971, in the Intergovernmental Conference of Experts for preparing an International Geological Correlation Programme. This Programme ... -
Ensayos de trazadores en medios fracturados de baja permeabilidad Ejemplos del Proyecto El Berrocal
(Sociedad Geológica de España, 1996)Tracer tests are of main importance to understand the behaviour of solutes at hydrological systems. In low permeability fractured media, performance of such tests becomes difficult due to the low flowrates achivable, to ... -
Estructura profunda de la cuenca de Cameros (Cordillera Ibérica) a partir de datos gravimétricos
(Sociedad Geológica de España, 1996)The Cameros basin (Iberian Chain) developed under a very subsident extensional regime during the latest Jurassic-early Cretaceous. Its fill constitutes a magasequence o f more than 5000 m of vertical thickness. That would ... -
Estudio comparativo de las morfologías de crecimiento teórica y experimental de cristales de malaquita
(Sociedad Geológica de España, 1996)The growth of malachite has been studied in a system involving the counter diffusion of Cu2+ and C 0 3” through a silica gel column . The growth morphologies obtained are interpreted on the basis of the supersaturation ... -
Estudio comparativo de los minerales de la fracción pesada en los sedimentos de las terrazas del Río Guadalete y fondos de la Bahía de Cádiz
(Sociedad Geológica de España, 1996)Heavy minerals of sediments from bottom of the Bay of Cádiz and terraces of the Guadalete river have been studied, for establish the genetic relationships and source areas. The use of surface feature analysis using SEM ... -
Estudio de inclusiones fluidas en granitos microfisurados. Mineralizaciones de W-Sn del Sistema Central Español
(Sociedad Geológica de España, 1996)The geometry of the ore fluid migration was investigated in the (W-Sn) mineralizated granites of the Spanish Central System. Based on microthermometry, Raman microprobe and textural relationships, six types of fluid ... -
Estudio de paleoalteraciones y paleosuperficies en el marco del PICG, proyecto 317. España
(Sociedad Geológica de España, 1996)The results obtained in the IGCP project 317, by the Spanish working group, can be separated into two general subjects: 1) paleoweathering profiles developed in the Iberian Hercynian Basement and their relationship with ... -
Estudio preliminar sobre la tectónica sinsedimentaria del Cretácico inferior en el borde septentrional de la Cubeta de Aliaga (Cordillera Ibérica)
(Sociedad Geológica de España, 1996)The Aliaga sub-basin was developed during the Early Cretaceous in an extensional context. Structures near the northern border of this sub-basin (normal faults, syntectonic unconformities and facies and thickness changes ... -
Estudios mineralógicos y litogeoquímicos de El Berrocal
(Sociedad Geológica de España, 1996)The different materials existing in the El Berrocal pluton are characterized from a mineralogical, chemical and geochemical point of view. The influence of the alteration processes on the migration/ retention of U, Th and ... -
Extensión mesozoica e inversión compresiva terciaria en la Cadena Ibérica: aportaciones a partir del análisis de un perfil gravimétrico
(Sociedad Geológica de España, 1996)The eastern part of Iberia underwent extension during the Mesozoic and, as a result, intraplate basins were formed. These basins were inverted during the Tertiary giving rise to the Iberian Chain thrust belt. The analysis ... -
Fluidos asociados a filones de cuarzo en la Sierra de Guadarrama. Sistema Central Español
(Sociedad Geológica de España, 1996)Fluids together with alteration were studied in representative hydrothermal barren quartz veins from central part o f Sierra de Guadarrama (Spain). Three types o f fluids have been distinguished: (i) an early fluid stage ... -
Formación de grafito a partir de fluidos: La mineralización de Huelma (Jaén)
(Sociedad Geológica de España, 1996)The volcanic-hosted graphite mineralization of Huelma Qaén) has been studied in order to stablish the mineralogical characteristics and mechanisms of formation. The graphite is highly ordered (as revealed by XRD and Raman ... -
Fracturación y migración de fluidos durante la evolución tectónica neogena en el Sector Central de las Cadenas Costero Catalanas
(Sociedad Geológica de España, 1996)The Neogene rift in the Catalan Coastal Ranges, located in the NE part of the Eastern Iberian Margin, corresponds to a system of grabens formed in the north-western margin of the Valencia Trough. Extensional activity was ...
